What do you mean, "whose fault was it?" It wasn't really anybody's FAULT, per se, it was just that she was a really tomboyish girl, and there was no real indication that she WASN'T a boy, since she was a little kid at the time. She apparently didn't know that she wasn't a boy, until she hit puberty and found out that she didn't really have... guy parts.
It's Magyar who taught her...to be a worrier to fight manly. This is what Himaruya explained in his Bamboo Blog.
You can find the post in diaries of April and September 2008. Himaruya meant Magyar to be the ancient Hangarian.Mools 07:47, October 25, 2010 (UTC)Mools